.form-inline {
  display: flex;
}
/* 通过级联这种方法控制bs的样式 */

.form-inline .btn,
.form-inline .form-control {
  margin: 1rem;
}


/* 弹出框定制 */
#div-alert{
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  display: none;
}